| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| NEEDHAM INVESTMENT MANAGEMENT LLC | 5.15% | 1.42M | 0 | 1.42M | /s/ James W. Giangrasso | James W. Giangrasso, Chief Financial Officer | |
| NEEDHAM ASSET MANAGEMENT, LLC | 5.15% | 1.42M | 0 | 1.42M | /s/ James W. Giangrasso | James W. Giangrasso, Authorized Person | |
| NEEDHAM AGGRESSIVE GROWTH FUND | 5.15% | 1.42M | 0 | 1.42M | /s/ James W. Giangrasso | James W. Giangrasso, Chief Financial Officer | |
| GEORGE A. NEEDHAM | 5.15% | 1.42M | 0 | 1.42M | /s/ George A. Needham | George A. Needham |